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  Screening for colon cancer is controversial even though we are advised to have a colonoscopy at age 50 as a routine. However, in asymptomatic people the risk of perforation or GI bleeding offsets the benefits. The role of other screens such as occult blood in the stool, barium enemas, sigmoidoscopy and virtual colonoscopies is discussed.              

  There are many different tests used in colon cancer screening and it is confusing to know which one is right for you. Not everyone should do the same test. There are controversies about if it is even necessary in asymptomatic people.        

The May of 2012 issue of the New England Journal of Medicine reports that sigmoidoscopy rather than colonoscopy could be used to screen for colon cancer. A clinical trial of 150,000 people was done where half had sigmoidoscopy and the other have nothing. They were followed over 12 years and over that interval there were 89 fewer cancer deaths and 275 more colon...